This 3 ingredient Weight Watchers 7Up cake is a super simple lemon cake mix recipe that is worth only 2 Weight Watchers points per slice! Frost your lemon cake with a layer of fluffy Cool Whip before topping it with some fresh fruit or lemon zest and you will be in heaven! This is one dessert you can enjoy guilt-free!
Skinny Lemon 7Up Cake Recipe
If dessert is your weakness like it is mine, I have finally found an easy cake mix recipe that doesn't taste like you're saving calories. It's light and fluffy due to the carbonation in the soda while the boxed cake mix brings the classic bright flavor you want in a lemon dessert.
You don't need to be on Weight Watchers to enjoy this lemon 7Up cake, but if you are, a slice will only cost you 2 WW points! With only 3 ingredients, this it's almost too good to be true.
Jump to:
🥘 Ingredients
You only need 3 simple ingredients for this cake. Just be sure to get diet 7Up and lite or fat-free Cool Whip for the WW points to add up correctly!
- Lemon Cake Mix - 15 ounces of any brand of lemon cake mix (I used Duncan Hines).
- Diet 7Up - 20 ounces.
- Cool Whip - 8 ounces of lite or fat-free Cool Whip.
*Be sure to see the recipe card below for ingredients, amounts & instructions!*
🔪 How To Make Lemon 7Up Cake
This recipe is definitely beginner-friendly. All you need is a mixing bowl, silicone spatula, and a 9x13 baking pan!
When sliced into 24 slices, each slice is a serving worth 2 weight watchers points.
- Preheat. Preheat your oven to 350°F (175°C) and spray a 9x13 baking pan with non-stick cooking spray.
- Mix. Empty a 15-ounce box of cake mix into a large mixing bowl. Pour in 20 ounces of Diet 7Up and mix gently until thoroughly combined. *Do NOT follow the instructions on the back of the box of cake mix.
- Bake. Pour the cake batter into your baking pan. Place your cake on the middle of the center rack in your oven and bake for 30-35 minutes.
- Cool. Remove your cake from the oven and set it aside to cool completely. Once cooled, top it with 8 ounces of Cool Whip. Spread it into an even layer across the top of the cake like frosting.
- Slice and serve. Slice your cake into 24 even slices. Top with zested lemon, fresh fruit, or bits of crumbled cake if desired, and serve.
Strawberries, raspberries, pineapple, or mandarin oranges would all be incredible on top of this fluffy, lemon cake. Even without any toppings, it is pretty darn good. Enjoy!
💭 Angela's Pro Tips & Notes
- Don't over-mix the cake mix and soda. The carbonation helps the cake bake up nice and fluffy. You don't want to pop all the bubbles and lose that carbonation!
- Let your cake fully cool! Cool Whip is thinner than frosting, so it will literally liquefy if you put it on a warm cake.
- Storing: Keep your cake covered in the refrigerator and enjoy within 3-4 days. Whipped cream, dairy or not, should not be kept at room temperature for more than 2 hours.
Can I Make Lemon 7Up Cupcakes Instead?
Yes! To make cupcakes, you will want to reduce the amount of 7Up from 20 ounces to 12 ounces (one can).
This should make about 20 cupcakes, they will be a touch more dense than the cake version, but it will help them keep together! Line a muffin tin with cupcake liners and bake at 350°F (175°C) for 15 minutes or until the cupcakes are springy to the touch.
Can I Use Different Soda To Make 7Up Cake?
Regardless of the flavor of cake mix or soda used, the concept remains the same! If using 7Up (or Sprite, or Sierra Mist), yellow or white cake mix would match the lemon-lime flavor (especially if you add a few teaspoons of lemon, lime, or orange zest).
Some other fun combinations would be:
- Chocolate Cake Mix and Diet Cherry Coke
- Spiced Cake Mix and Diet Ginger Ale
- Chocolate Cake Mix and Diet Dr. Pepper
- Cherry Chip Cake Mix and Diet Cherry 7Up
🍋 More Lemon Treats!
- Lemon Blueberry White Chocolate Chip Cookies
- Lemon Bars
- Strawberry Pineapple Lemonade Bars
- Lemon Crinkle Cookies
- Lemon Strawberry Bread
- Microwave Lemon Curd
Do you love a recipe you tried? Please leave a 5-star 🌟rating in the recipe card below and/or a review in the comments section further down the page.
Stay in touch with me through social media @ Pinterest, Facebook, Instagram, or Twitter! Subscribe to the newsletter today (no spam, I promise)! Don't forget to tag me when you try one of my recipes!
📖 Recipe Card
Weight Watchers 7Up Cake
Ingredients
- 15 oz lemon cake mix
- 20 oz Diet 7Up
- 8 ounces Lite Cool Whip (or fat-free)
Instructions
- Preheat your oven to 350°F (175°C) and spray a 9x13 baking pan with non-stick cooking spray.
- Meanwhile, add the cake mix to a large mixing bowl, then pour in the 7Up. Stir gently until combined. *Do Not follow the instructions on the back of the box of cake mix.
- Pour the batter into your prepared baking pan. Place it on the middle of the center rack in your oven and bake for 30-35 minutes.
- Remove the cake from the oven and set aside to cool fully. Once cooled, spread the whipped cream over the top of the cake in an even layer like frosting.
- Slice into 24 squares, top with lemon zest, fresh fruit, or crumbled bits of cake if desired, and serve.
Notes
- Don't over-mix the cake mix and soda. The carbonation helps the cake bake up nice and fluffy. You don't want to pop all the bubbles and lose that carbonation!
- Let your cake cool fully! Cool Whip is thinner than frosting, so it will literally liquify if you put it on a warm cake.
- Storing: Keep your cake covered in the refrigerator and enjoy within 3-4 days. Whipped cream, dairy or not, should not be kept at room temperature for more than 2 hours.
M. Cross says
I wonder if baking powder might make it feel less dense?
Angela Latimer says
It wouldn't hurt to add some. I'm sure it would lighten it up at least a bit.
Karen says
Have you ever added an egg or two to the mix?
Angela @ BakeItWithLove.com says
No, I haven't ever added egg to this recipe. If you give it a go, be sure to let me know how it was. Thanks!!
Barb says
My cake is flat
Angela @ BakeItWithLove.com says
Yes, it's not a super fluffy cake. It should still be tender and moist.
jan says
could you use a sugar free cake mix?
Angela @ BakeItWithLove.com says
Yes, definitely! Swapping your cake mix for a sugar-free cake mix will work wonderfully. Enjoy!